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Think I found invaders in our river! Are they native?

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I was just down at the San Gabriel river, and I found a Petsmart fish bag in the water. Never good.
I called the store and gave them the bag's fish ID number, and it turned out it was 24 feeder goldfish. So either someone put 24 goldfish in the river, or they used the bag they had on hand to transport the fish I saw moments later. Two large blue fish, one male, one female, digging out a nest site.
I looked them up, and they're apparently Theraps lentiginosus, AKA Big Blue Chichlids. Also, these are native to an area somewhere near us, although I'm pretty sure they were introduced. Can anyone tell me if I should be concerned, or if these guys are okay to have in the river? I lost track of them, I'm not sure if I could possibly catch them... Although people fish there, I'm thinking someone might catch them.

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I'm actually not sure that they don't belong there... I found out that they actually live in South Texas, is it possible that they've gotten up here to Central Texas? I just want to make sure I don't start up a big fuss for something that won't be that much of a problem.

Yes, thanks. I sent them an Email telling them what I saw and the near-exact location, right down to about a ten-by-thirty-foot section of shallow river. If they do send someone, I think a seine net would catch the blues fairly easily.